8140-4000 396 Small Block Chevy SX Series -5cc Flat Top SBC 23 Degree Forged Piston Set 4.000 inch bore COMP HEIGHT: 1.362"
8140-4000 396 Small Block Chevy SX Series -5cc Flat Top SBC 23 Degree Forged Piston Set 4.000 inch bore COMP HEIGHT: 1.362"
8140-4000 396 Small Block Chevy SX Series -5cc Flat Top SBC 23 Degree Forged Piston Set 4.000 inch bore COMP HEIGHT: 1.362"
8140-4000 396 Small Block Chevy SX Series -5cc Flat Top SBC 23 Degree Forged Piston Set 4.000 inch bore COMP HEIGHT: 1.362"
8140-4000 396 Small Block Chevy SX Series -5cc Flat Top SBC 23 Degree Forged Piston Set 4.000 inch bore COMP HEIGHT: 1.362"
8140-4000 396 Small Block Chevy SX Series -5cc Flat Top SBC 23 Degree Forged Piston Set 4.000 inch bore COMP HEIGHT: 1.362"
Load image into Gallery viewer, 8140-4000 396 Small Block Chevy SX Series -5cc Flat Top SBC 23 Degree Forged Piston Set 4.000 inch bore COMP HEIGHT: 1.362"
Load image into Gallery viewer, 8140-4000 396 Small Block Chevy SX Series -5cc Flat Top SBC 23 Degree Forged Piston Set 4.000 inch bore COMP HEIGHT: 1.362"
Load image into Gallery viewer, 8140-4000 396 Small Block Chevy SX Series -5cc Flat Top SBC 23 Degree Forged Piston Set 4.000 inch bore COMP HEIGHT: 1.362"
Load image into Gallery viewer, 8140-4000 396 Small Block Chevy SX Series -5cc Flat Top SBC 23 Degree Forged Piston Set 4.000 inch bore COMP HEIGHT: 1.362"
Load image into Gallery viewer, 8140-4000 396 Small Block Chevy SX Series -5cc Flat Top SBC 23 Degree Forged Piston Set 4.000 inch bore COMP HEIGHT: 1.362"
Load image into Gallery viewer, 8140-4000 396 Small Block Chevy SX Series -5cc Flat Top SBC 23 Degree Forged Piston Set 4.000 inch bore COMP HEIGHT: 1.362"

PART #: 8140-4000

8140-4000 396 Small Block Chevy SX Series -5cc Flat Top SBC 23 Degree Forged Piston Set 4.000 inch bore Pin Dia.: 0.927" Comp Height: 1.362"

$599.95
$599.95
Sale Sold out
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Ships in 1 - 8 days

Ships in 1 - 8 days

Made in the USA

Made in the USA

Secure Payment

Secure Payment

Piston & Ring Kit Option:
This is a pre order item. We will ship it when it comes in stock.

390 Small Block Chevy, SX, Comp Height: 1.362, -5cc Flat Top , PIN: .927", Full Floating or Press Fit, Ring Groove: 1/16-1/16-3/16" , Stroke: 3.875", ROD: 5.7, Approx Comp Ratio: 58cc-12.21, 64cc-11.35, 70cc-10.6


Engine Brand: Chevy

Engine Family: Small Block Chevy

Engine Size: 396

With/Without Rings: Without Rings

Cylinder Bore Size: 4.000 in , 101.520 mm

Ring Width: 1/16-1/16-3/16"

Compression Height: 1.362"

Pin Diameter: 0.927"

Connecting Rod Length: 5.700"

Crankshaft Stroke: 3.875"

Piston Series: SX 4032 Alloy

Alloy: 4032 Alloy

Cylinder Head: SBC 23 Degree

TDC Assembly Height: 9.000"

Piston Top Aprox. Comp. Ratio:

-5cc Flat Top SBC 23 Degree
ChamberComp Ratio
5812.21 to 1
6411.35 to 1
7010.6 to 1

Download Piston Instructions

 
Features: Piston Series
 

E series

  SX series  1-FX series  2-FX series  3-FX series
Broached pin oiling slots

x

x

 

 

 
Drilled, forced wrist pin oiling

 

x

x

x

x
Forged drain-back windows

x

 

 

 

 
Drilled bottom ring land intersecting oil groove drain-backs

 

x

x

x

x
Slightly larger, deeper valve reliefs than OEM

x

 

 

 

 
CNC machined valve reliefs for moderate performance heads and cam combinations

 

x
Larger, deeper CNC valve reliefs for more aggressive cylinder head and cam combinations

 

 

x

x

x
Premium Aircraft spec. 4032 low expansion alloy

x

x

x

 

 
Premium Aircraft spec. 2618 alloy

 

 

 

x

x
Blower, Turbo, NOS ready

 

x

x

x

x
Brushed piston crown

 

 

x

x

x
Turned dishs

x

x

 

 

 
Max Quench milled dishs

 

 

x

x

x
Additional CNC milling for weight reduction in non-critical areas

 

 

x

x

x
Patented “X Groove” skirt for superior cylinder and ring life

 

 

x

x

x
Thinner/shallower Ring grooves for maximum ring seal and land strength

 

 

x

x

x
Low volume contact reduction grooves    

x

x

x
2nd ring land accumulator groove prevents ring flutter    

x

x

x
3rd ring land scraper relief    

x

x

x
Oil ring groove relief reservoir    

x

x

x
Inner and outer pin boss weight reduction radiusing    

x

x

x
Tighter control of crown thickness yields consistently lighter parts    

x

x

x
Dynamic skirt milling controls skirt thickness for consistently lighter parts  

 

x

x

x
Diamond-turned high strength skirts

x

x

x

x

x
High-strength piston pins

x

x

x

x

x
Extreme Duty XR wrist pins      

 

x
Horizontal Gas Ports enhance ring seal        

x
Forged and machined in the USA

x

x

x

x

x
Piston Specs

Engine Brand: Chevy

Engine Family: Small Block Chevy

Engine Size: 396

With/Without Rings: Without Rings

Cylinder Bore Size: 4.000 in , 101.520 mm

Ring Width: 1/16-1/16-3/16"

Compression Height: 1.362"

Pin Diameter: 0.927"

Connecting Rod Length: 5.700"

Crankshaft Stroke: 3.875"

Piston Series: SX 4032 Alloy

Alloy: 4032 Alloy

Cylinder Head: SBC 23 Degree

TDC Assembly Height: 9.000"

Piston Top Aprox. Comp. Ratio:

-5cc Flat Top SBC 23 Degree
ChamberComp Ratio
5812.21 to 1
6411.35 to 1
7010.6 to 1

Download Piston Instructions

Piston Comparison Chart
 
Features: Piston Series
 

E series

  SX series  1-FX series  2-FX series  3-FX series
Broached pin oiling slots

x

x

 

 

 
Drilled, forced wrist pin oiling

 

x

x

x

x
Forged drain-back windows

x

 

 

 

 
Drilled bottom ring land intersecting oil groove drain-backs

 

x

x

x

x
Slightly larger, deeper valve reliefs than OEM

x

 

 

 

 
CNC machined valve reliefs for moderate performance heads and cam combinations

 

x
Larger, deeper CNC valve reliefs for more aggressive cylinder head and cam combinations

 

 

x

x

x
Premium Aircraft spec. 4032 low expansion alloy

x

x

x

 

 
Premium Aircraft spec. 2618 alloy

 

 

 

x

x
Blower, Turbo, NOS ready

 

x

x

x

x
Brushed piston crown

 

 

x

x

x
Turned dishs

x

x

 

 

 
Max Quench milled dishs

 

 

x

x

x
Additional CNC milling for weight reduction in non-critical areas

 

 

x

x

x
Patented “X Groove” skirt for superior cylinder and ring life

 

 

x

x

x
Thinner/shallower Ring grooves for maximum ring seal and land strength

 

 

x

x

x
Low volume contact reduction grooves    

x

x

x
2nd ring land accumulator groove prevents ring flutter    

x

x

x
3rd ring land scraper relief    

x

x

x
Oil ring groove relief reservoir    

x

x

x
Inner and outer pin boss weight reduction radiusing    

x

x

x
Tighter control of crown thickness yields consistently lighter parts    

x

x

x
Dynamic skirt milling controls skirt thickness for consistently lighter parts  

 

x

x

x
Diamond-turned high strength skirts

x

x

x

x

x
High-strength piston pins

x

x

x

x

x
Extreme Duty XR wrist pins      

 

x
Horizontal Gas Ports enhance ring seal        

x
Forged and machined in the USA

x

x

x

x

x